In southeast Louisiana, crews are laboring hard to build miles of new fortifications to defend the region against another Hurricane Katrina-like disaster. But as local flood-protection officials learned last month, understanding and applying the evolving science of storm-surge and flood risk modeling is an even tougher race. Photo: Angelle Bergeron Mathijs Van Ledden, president of Haskoning Inc., a New Orleans-based division of Dutch engineering firm Royal Haskoning and flood protection adviser to the Corps of Engineers, describes storm-surge studies in Louisiana dating from 2005. Related Links: Corps Expects July Start at Seabrook “What we know about storm surge is changing
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.